Producer-gas furnace.



No. 805,235. PATENTED NOV. 21, 1905. 1P. SCHMIDT & A'. DESGRAZ.

PRODUCER GAS FURNA-GE.

APPLICATION FILED Mums, 1905.

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No. 805,235. PATENTED NOV. 2l, 1905. P. SCHMIDT L A. DBSGRAZ.

PRODUCER GAS PURNAGE. APPLIUATIDN FILED MM45, 1905.

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Z? 'Zgznsdeu .combustion zone within the said shaft.

NITED STATES PATENT OFFIOE.

PRODUCER-GAS FURNACE.

Specification of Letters Patent.

Patented Nov. 21, 1905.

Application filed March 15, 1905. Serial No. 250,277.y

To all wz/onz/ it Nifty concern:

Be it known that we, PAUL SCHMIDT and AnoLPHE DESGRAZ, engineers, of La]?rinzen strasse, Hanover, Germany, have invented cert-ain new anduseful Improvements in or Relating to Producer-Gas Furnaces, of whichthe following is a clear and perfect description.

This invention relates to gas-furnaces for use in the manufacture orproduction of producer, power, and similar gas, and which in theabstracted gases are utilized in the known manner for heating the freshfuel in the upper portion of the furnace-shaft, while the heavy gasesnewly generated are drawn oil' at several points and returned into tpe norder to obtain with such furnaces gases of a composition as uniform aspossible, and also to prevent the tarry products therein contained frombeing deposited in the return-pipe, the gas according to this inventionpasses through numerous superimposed apertures in the gas-producingchamber and enters a collecting-chamber arranged close to thegas-producing chamber. All the gas flowing from different parts of thegas-producin g chamber becomes uniformly mixed in thiscollecting-chamber and is, moreover, heated by thepreviously-accumulated gases and by the walls of said chamber, so thatnone of its tarry products become deposited in the return feed-pipe.Furthermore, a portion of the dust carried along with the gas isdeposited in the collecting-chamber. This manner of treatment of the gasinsures that while the gas is returning to the combustion zone of thefurnace its quality is always of a uniform character.

Some forms of producer-gas furnaces constructed according to thisinvention are shown in the accompanying drawings, wherein` Figure l is avertical section through such a furnace. Fig. 2 isA a similar view, butat right angles to Fig. 1. Fig. 3 is a horizontal section taken on theline a: of Fig. 1. Fig. 4 is a vertical section of another form ofgas-furnace. Fig. 5 is a vertical section of Fig. 4, taken at rightangles thereto. Fig. 6 is a horizontal section taken on the line y y ofFig. Ll.

On the four sides and around the upper part of the gas-producer shaft aare formed hollow spaces, chambers, or passages. The distilled gasespass 'first through the opening d into the upwardly-extending verticalpassage e, traverse the passage f below the partition r, then thepassage 7L above them, and in this way reach the outlet -V pipe t'. Theends of the passages or chambers are provided with cover-plates p,adapted to close chamber m, which communicates on one side by means ofthe passages or openings n with the interior of said shaft, and on theother side is in communication, through the passage 0, with the pipes cc, so that the gaseous products are all collected-at the points wherethey were distilled or generated. All the light and heavy and warm andcold gas mix in the chamber m and become purified by allowing the dustto deposit. A gaseous mixture of uniform character is thus supplied tothe hottest part of the shaft, for which purpose a steam-injector, as t,of the ordinary kind may be employed. Owing to the fact that the dust ispreviously separated from the gases, all choking of the suctionpipeadrawback which often causes the entire stoppage of the work-is avoided.

FiUsJl, 5, and 6 refer to a modification in whic the gaseous productsformed in the upper part of the shaft are not only drawn off from oneside, but from two or more sides, by the aid of several exhaust devicesand are returned to the lower and hottest zone. Besides the chamber mforrthe removal of the gaseous products generated in the upper partthere is also a second chamber m', from which the heavy gases are drawnoff by means of the passages n', the circulating-pipes c', and. aseparate exhaust device and are again returned to the furnace.

Connected with the pipes c and c are steaminjectors t and t for forcingthe gases into the Zone of combustion of the fuel in thecombustion-chamber of the furnace.

The lower end of each type of furnace is controlled by a water seal,(designated in one case by p and in the other by p,) while the furnacesare provided interiorly thereof with grates, as s and s', of theordinary construction.

Having now particularly described and ascertained the nature of our saidinvention and in what manner the same is to be performed, we declarethat what we claim is- 1. A producer-gas furnace having a col- IOOlecting-chamber in the wall and in communication with the upper part ofthe shaft thereof at superposed places, to receive distilled ases fromsaid shaft, and means for drawing the gases from the said cnainber anddirecting them into the zone of 'combustion of the fuel in the furnace,the wall of the latter vbeing chambered and having a passage openinginto said shaft above the point at which said gases are injected intothe fuel, said passage serving to receive the gases passed vthrough thefuel and to conduct them into the last-mentioned cliambered portion ofthe furnace, so as to heat the 'gases in said lastthe zone of combustionof the fuel in the furnace, said chamber being in the wall of thefurnace and having a removable cover to provide access to said chamberto withdraw the dust therefrom, settling onto the bottom thereof.

3, A producer-gas furnace having a collecting-chamber in communicationat superposed places, with the upper part of the shaft thereof, toreceive distilled gases from said shaft, and means for drawing gasesfrom the chamber and for directing` the same intov the zone ofcombustion of the fuel in the furnace.

In testimony whereof we have hereunto set our hands in presence of twosubscribing witnesses.

PAUL SCHMIDT. ADOLPHE DESGRAZ.

lVitnesses LEONORE RAscI-i, ANNIE DIZZEL.

